By Rachel Torres • May 21, 2026 • 3 min read
By diana_reeves • May 21, 2026 • 3 min read
The U.S. Environmental Protection Agency has proposed a sweeping revision to Section 401 of the Clean Water Act that would significantly curtail the ability of states and tribal governments to block or delay federally approved infrastructure projects on water quality grounds. The proposed rule, announced January 13, 2026, and now open for public comment through mid-February, represents one of the most consequential deregulatory actions taken under the current administration on environmental law.
The move reverses a 2023 Biden-era rule that had expanded the scope of state review under Section 401 — a provision that allows states to certify whether a proposed project meets applicable water quality standards before federal permits can be issued. Under the new EPA proposal, states would no longer be permitted to deny or condition certifications based on concerns that fall outside the narrow statutory language of the Clean Water Act. Industry groups have long argued the 2023 rule enabled delay tactics and “weaponization” of the certification process; the EPA’s framing now mirrors that criticism directly.
What Section 401 Does — and Why This Change Matters
Section 401 of the Clean Water Act requires that any applicant seeking a federal license or permit for an activity that may result in a discharge into navigable waters first obtain a water quality certification from the relevant state or tribal authority. In practice, this certification has been used by state environmental agencies as a de facto veto over projects ranging from pipelines and mining operations to hydroelectric facilities and industrial expansions.
The 2023 rule clarified that states could consider a broader set of water quality factors — including cumulative impacts, climate resilience, and environmental justice concerns — when reviewing certification requests. The Trump EPA’s proposed reversal would strip those expanded considerations away, reverting to a narrower interpretation focused strictly on the “applicable water quality-related regulations” of the certifying authority.
epa Administrator Lee Zeldin described the change as a restoration of proper statutory boundaries. “We’re strengthening the role of state and tribal partners while ensuring environmental protections are implemented lawfully, efficiently, and consistent with congressional intent,” Zeldin said in a statement accompanying the proposal. Senate Environment and Public Works Committee Chair Shelley Moore Capito (R-WV) praised the move as aligning with her longstanding effort to “update the Section 401 certification process to streamline infrastructure development.”
Environmental and Legal Concerns Mount
Environmental advocates have responded sharply. Critics warn that narrowing Section 401 review will embolden pipeline operators and industrial developers to pursue projects that states cannot meaningfully oppose, even in cases where water quality risks are substantial and well-documented.
The timing is significant: several major pipeline proposals currently pending federal review — including the Keystone XL variant reroutes and Gulf Coast LNG adjacent projects — could be advanced more quickly if Section 401 certifications can no longer be denied on broader environmental grounds. States like New York, California, and Washington, which have used Section 401 aggressively to impose stricter conditions on fossil fuel infrastructure, would see their regulatory leverage substantially diminished.
Legal challenges are all but certain. State attorneys general from at least a dozen jurisdictions have indicated they will file suit if the rule is finalized, arguing the EPA lacks statutory authority to narrow the scope of state review in this manner and that the proposal contradicts the text and intent of the Clean Water Act. A coalition of environmental groups has separately announced plans to challenge the rulemaking on administrative procedure grounds, arguing the 30-day public comment period is insufficient for a rule of this magnitude.
Implications for Infrastructure and Water Quality
The EPA has stated it expects the rule to accelerate permitting timelines for “vital energy, infrastructure, and development projects critical to America’s economic and national security.” The agency estimates that certification delays under the 2023 framework added months to years to some project timelines — a claim the Government Accountability Office has not independently verified.
The practical impact on water quality will depend heavily on implementation. If finalized, the rule would take effect for new certification requests immediately upon publication of the final rule, expected in spring 2026. Existing certifications already granted are not subject to retroactive revocation under the proposal.
For communities downstream from proposed projects — particularly in environmental justice communities that have historically borne disproportionate pollution burdens — the rollback represents a loss of a critical safeguard with no clear replacement at the federal level. The EPA’s proposal does not include any alternative mechanism for addressing water quality concerns that fall outside the narrowed Section 401 framework.
“This rule doesn’t streamline permitting — it strips away the last meaningful check states have over projects that threaten rivers, aquifers, and drinking water supplies. The consequences will be written in contaminated water for years to come.”
— Maria Estevez, Senior Attorney, Environmental Protection Project
The 30-day comment period closes February 14, 2026. Final action is expected before the end of spring.
